<template>
	<view>
		<!-- 使用自定义的搜索组件 -->
		<my-search @click="gotoSearch"></my-search>
		
		
		<view class="scroll-view-container">
			<!-- 左侧的滑动区域 -->
			<scroll-view class="left-view-container" scroll-y="true" :style="{height:wh+'px'}">
				<block v-for="(item,i) in cateList" :key="i">
					<view :class="['left-scroll-view-item',i===active?'active':'']" @click="activeChanged(i)">{{item.cat_name}}</view>
				</block>
			</scroll-view>
			<!-- 右侧的滑动区域 -->
			<scroll-view scroll-y="true" :style="{height:wh+'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<!-- 二级分类标题 -->
					<view class="cate-lv2-title">
						/{{item2.cat_name}}/
					</view>
					<!-- 当前二级分类下的三级分类列表 -->
					<view class="cate-lv3-list">
						<!-- 三级分类的item项 -->
						<view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
							<!-- 三级分类的图片 -->
							<image :src="item3.cat_icon" mode=""></image>
							<!-- 三级分类的文本 -->
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import badgeMix from'@/mixins/tabbar-badge.js'
	
	export default {
		mixins:[badgeMix],
		data() {
			return {
				// 当前设备可用的高度
				wh: 0,
				cateList:[],
				active:0,
				// 二级分类的列表
				cateLevel2:[],
				scrollTop:0
			};
		},
		onLoad() {
			const sysInof = uni.getSystemInfoSync()
			// console.log(sysInof)
			this.wh = sysInof.windowHeight-50
			
			this.getCateList()
		},
		methods:{
			// 获取分类列表数据
			async getCateList(){
				const{
					data:res
				}= await uni.$http.get('/api/public/v1/categories')
				if(res.meta.status!==200) return uni.$showMsg()
				this.cateList=res.message
				
				// 为二级分类赋值
				this.cateLevel2=res.message[0].children 
				
			},
			activeChanged(i){
				this.active=i
				
				// 重新为二级分类赋值
				this.cateLevel2=this.cateList[i].children 
				this.scrollTop=this.scrollTop===0?1:0
			},
			// 跳转到商品列表页面
			gotoGoodsList(item){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?cid='+item.cat_id
				})
			},
			gotoSearch(){
				// console.log('ok')
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			},
		}
	}
</script>

<style lang="scss">
	.scroll-view-container {
		display: flex;

		.left-view-container {
			width: 120px;
		}
		.left-scroll-view-item{
			background-color: #F7F7F7;
			line-height: 60px;
			text-align: center;
			font-size: 12px;
		
			
			&.active{
				background-color: #ffffff;
					position: relative;
				&::before{
					content: '';
					display: block;
					width: 3px;
					height: 30px;
					background-color: #c00000;
					position: absolute;
					top: 50%;
					left: 0;
					transform: translateY(-50%);
				}
			}
		}
	}
	.cate-lv2-title{
		font-size: 12px;
		font-weight: bold;
		text-align: center;
		padding: 15px 0;
	}
	.cate-lv3-list{
		display: flex;
		flex-wrap: wrap;	
		.cate-lv3-item{
			width: 33.33%;
			display: flex;
			flex-direction: column;
			justify-content: center;
			align-items: center;
			margin-bottom: 10px;
			image{
				width: 60px;
				height: 60px;
			}
			text{
				font-size: 12px;
			}
		}
	}
</style>
